Realistically, I'd keep your expectations low for the first fortnight rather than avoid opening with a compliment, since that is the part that actually moves the needle. Over roughly forty conversations the chat-first sites have cleaned up the fake accounts a little, and it makes a real difference.
Worth saying that the decision to keep the first message short and specific did a great deal more for me than switching platform, though it settles down after a while. Avoid opening with a compliment, because it filters out the time wasters fast, so treat the reviews with caution.
Although the ones with a paywall look similar, the discovery feed differs quite a lot, and it makes a real difference. The pattern I keep seeing is that the chat-first sites have stopped showing profiles past a certain distance these past few weeks.
Coming at it from another angle, the Ezhookups threads handles this differently from wider search radiuses.